Cold engine stumble, with drivers little backfire

I took off out of the driveway last night, had a bit of a stumble, then a pop (backfire) from what sounded like the drivers side. It goes away when it warms up. But the car seems sluggish, more so than my 95. He just changed the plugs, no opti though. I'm wondering if i've got a bad wire. But doesn't explain y it does it when its cold only.

On another note, this has a PCM tune from PCM for less, and it shifts WICKED hard. Can i retune this to shift easier? I can't believe he drove it this way for years, because it hurts my neck on a good hard pull into 2nd and 3rd.

I took off out of the driveway last night, had a bit of a stumble, then a pop (backfire) from what sounded like the drivers side. It goes away when it warms up. But the car seems sluggish, more so than my 95. He just changed the plugs, no opti though. I'm wondering if i've got a bad wire. But doesn't explain y it does it when its cold only.

On another note, this has a PCM tune from PCM for less, and it shifts WICKED hard. Can i retune this to shift easier? I can't believe he drove it this way for years, because it hurts my neck on a good hard pull into 2nd and 3rd.

If it's missing when cold then that would lead me to think it's related to being in open loop mode. That would make me think it's an issue with the maf, iat, or some other intake related sensor. I may be way off but it's where I'd start looking.